Hi Jim, The schematic I have doesn't show the pin 11 inhibit pulled low in the KAT500. It goes to the microcontroller through a series 4.99K resistor. But what it is used for in the KAT500 is an interesting question.
Back to your original question, I have the K3-KAT-KPA set up and use Digout1 to switch the PR6. I'd have to check more closely but I don't think the KPA or KAT is pulling pin-11 low all the time. Cheers, Fred Fred Cady fcady at ieee dot org > -----Original Message----- > From: [email protected] [mailto:elecraft- > [email protected]] On Behalf Of Jim Miller > Sent: Friday, August 09, 2013 6:18 PM > To: Elecraft Reflector > Subject: Re: [Elecraft] Digout1? > > I found a thread on this reflector that mentions the PIN11 problem. It > was > from April of this year and I had forgotten it. I'll just break another > pin > off in the Key Line Interrupter to solve the problem. > > Another mystery however is why the INHIBIT line is there in the first > place. Its operation isn't described in the KAT500 and the KAT500 has > it > permanently pulled low. Note that the KAT500 document calls it INHIBIT > (inferring a positive active polarity) while the KPA500 document calls > it > INHIBIT# (inferring active low polarity.) Since I have the INHIBIT IN > disabled via the KPA500 menu nothing is happening here anyway between > them. > > In neither document is the purpose described. Note that this is not the > PTT > (PIN10) which is well documented and working fine for me. > > Still not clear either why the KAT500 would have this line pulled low. > According to the KAT500 schematics PIN11 is passed through and only > sensed > by the microcontroller via a 4.99K/0.1uf network. The cable when > disconnected from the KAT500 but still connected to the K3/PR6 doesn't > interfere with the DIGOUT1 function. Only when the KAT500 is connected. > BTW, for this test the cable going to the KPA500 is not present so > neither > the cable or the KPA500 can be contributing. > > Looks like it's time to open the KAT500F. > > jim > > > > > On Fri, Aug 9, 2013 at 3:32 PM, Jim Miller <[email protected]> wrote: > > > I've got the K3/KAT500/KPA500 all chained together with the Elecraft > DB15 > > accessory cables. > > > > I'm now in the process of connecting up the PR6/DIGOUT1 enabling > line. > > > > I've removed the jumper in the PR6 and connected the control signal > to the > > PR6 to DIGOUT1 and all works well; switching the CONFIG: DIGOUT1 menu > entry > > causes the relays in the PR6 to switch audibly. > > > > However when I connect up the DB15 chain to the KAT500 the DIGOUT1 > line is > > permanently pulled low. > > > > Referring to the cable diagram and the KAT500/KPA500 connector > callouts it > > appears the KAT500/KPA500 use the same PIN11 as DIGOUT1 for an > INHIBIT# > > function. > > > > I disconnected the KPA500 from the chain and the KAT500 appears to be > > pulling this line low all the time. > > > > Do I need to remove PIN11 from the cable as well? I already have the > > Keyline interrupter installed which has PIN10 removed. > > > > Confused... > > > > jim ab3cv > > > > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
